New York officials tout their deal to land a new Amazon headquarters as can't-miss math. The city and state put up $2.8 billion in tax breaks and grants. In return, they get an economic engine expected to generate $27 billion in new tax money over a quarter-century.
"This is a big moneymaker for us. Costs us nothing," Gov. Andrew Cuomo said when the agreement was announced.
Experts say the economic equation isn't that simple.